2012 Kawasaki Jet Ski Ultra 300X, 2012 Kawasaki Jet Ski Ultra 300X The Most Powerful Jet Ski Yet Tops the 300 Horsepower Mark Power is great. Power plus handling, even better. Power plus handling plus all the features a hardcore enthusiast wants in a personal watercraft? That's the best. With the incredible Jet Ski Ultra 300X producing 300 horsepower, making it the most powerful Jet Ski ever bu...